SMTP Email error VM304 Authentication Denied

[morninglory]

Hey, I'm not OP, but have encountered the same SMTP issue as of yesterday on all devices outside the webmail. 

I have ran the standard curl command advised in other posts and received the following message: 

525 5.7.13 Authentication Denied (VM304)

Any ideas how to resolve this? Thanks.  

[MOD EDIT: Subject title changed for clarity]

[Graham_A]

VM304 error message has a specific meaning which is that the account concerned no longer exists on the VM backend database.

Do you still have a VM broadband account to which the email address concerned is connected?

[Matthew_ML]

Hey there, thank you for reaching out and a warm welcome to the community I am sorry to hear about this.

As mentioned above do you still have an active account with us?